package com.itheima.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.baomidou.mybatisplus.extension.toolkit.Db;
import com.itheima.common.CustomException;
import com.itheima.entity.Category;
import com.itheima.entity.Dish;
import com.itheima.entity.Setmeal;
import com.itheima.mapper.CategoryMapper;
import com.itheima.service.CategoryService;
import com.itheima.service.DishService;
import com.itheima.service.SetmealService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;


@Service
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category> implements CategoryService {

    @Autowired
    private DishService dishService;
    @Autowired
    private SetmealService setmealService;


    /*
    * 根据ids删除分类，删除之前进行判断
    * */
    @Override
    public void remove(Long ids) {
        //添加查询条件，根据分类id进行查询

        //service层
        /*List<Dish> dish = Db.lambdaQuery(Dish.class)
                .eq(Dish::getCategoryId,ids)
                .list();*/

        //mapper层
        LambdaQueryWrapper<Dish> dishLambdaQueryWrapper = new LambdaQueryWrapper<>();
        dishLambdaQueryWrapper.eq(Dish::getCategoryId,ids);
        long count = dishService.count(dishLambdaQueryWrapper);


        //查询当前分类是否已经关联菜品，如果已经关联，则抛出一个业务异常
        if(count>0){
            //throw new RuntimeException("业务异常");
            throw new CustomException("当前分类下关联了菜品，不可以删除！");
        }

        //查询当前分类是否已经关联套餐，如果已经关联，则抛出一个业务异常
        LambdaQueryWrapper<Setmeal> setmealLambdaQueryWrapper = new LambdaQueryWrapper<>();
        setmealLambdaQueryWrapper.eq(Setmeal::getCategoryId,ids);
        long count1 = setmealService.count(setmealLambdaQueryWrapper);
        if(count1>0){
            throw new CustomException("当前分类下关联了套餐，不可以删除！");
        }

        //正常删除分类
        this.removeById(ids);
    }
}
